The invention relates to a combined unipolar circuit breaker and neutral line isolator. In order to guarantee the insulation distance between the neutral rail (96) and the phase terminal (36), a protection cap (98) made of an insulating material is mounted by clipping to a fixing member (100) provided on a projection (101) of the neutral line isolator (16). A lateral protuberance (110) masks the notch (94) for access to the phase terminal (36). IMAGE
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